Have Boat Questions? Ask a Boat Repair Expert.
Hello Kurt. My name is Tan.
The boot should not shock you. The fuel lines are sucking air. If the fuel line doesn't fit tight to the connections there is no clamp you can use to get it tight enough to keep air out. Now this may not be your only issue.
Has the engine been sitting unused for awhile?
When you run the boat squeeze the primer bulb when engine is acting up. Does it run better?
Post back with questions and findings.
Squeezing the primer bulb usually indicates a fuel delivery issue. This can air or a fuel restriction or failing fuel pump. The way to find out which is to run the engine on an auxiliary fuel source. This will tell us if it is the boat side fuel system or the engine. If it still acts up and squeezing the primer bulb helps the fuel pump is the cause of the problem. If engine runs better then we know you have a restriction or and air leak. The restriction can be debris in the fuel tank clogging the fuel supply or an air leak which we know is possibly the fuel line connections.
The is no reason for setting to be off unless someone has been messing with the settings they don't go out of adjustment. Now what I have seen inexperienced mechanics start playing with adjustments trying to get engine running better wrong they don't cause engine performance issue. It is either ignition of fuel..
One other test you can do that will tell us if it is a carburetor issue is choke the engine when it acts up. Does it run better?